These days using MacOS 10.6 what is the conventional wisdom on using system utilities like Disk Warrior and Tech Tool Pro? Would most of the experts say it's a good thing to have in your software inventory? I ask because I have the 3.0 version of DW which I use on my G5 and I just upgraded my MBP to 10.6 and I'm wondering if the upgrade of $49 would be well spent. Opinions? Thanks!